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Other Investments (Safehold Inc) (Details)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2023
USD ($)
item
Sep. 30, 2023
USD ($)
shares
Sep. 30, 2023
USD ($)
shares
Safehold Inc.      
Schedule of Equity Method Investments [Line Items]      
Number of shares owned (in shares) | shares   13.5 13.5
Equity interest   19.00% 19.00%
Safehold Inc. | Maximum      
Schedule of Equity Method Investments [Line Items]      
Beneficial ownership percentage under which restrictive voting requirements no longer apply 7.50%    
Percentage of ownership threshold under which registration rights will terminate. 2.00%    
Safehold Management Services      
Schedule of Equity Method Investments [Line Items]      
Management fees   $ 6.3 $ 13.5
Safehold Management Services | Affiliated entity      
Schedule of Equity Method Investments [Line Items]      
Management agreement renewal term 1 year    
Annual management fee - Year 1 $ 25.0    
Annual management fee - Year 2 15.0    
Annual management fee - Year 3 10.0    
Annual management fee - Year 4 $ 5.0    
Number of initial annual contract terms | item 4    
Annual management fee percent of gross book value, year five and thereafter 2.00%    
Notice required to terminate management agreement with cause 30 days    
Percentage approval of independent directors to terminate management agreement without cause 66.70%    
Termination fee, termination without cause $ 50.0    
Termination fee due to liquidation of consolidated assets after third anniversary of agreement 0.0    
Termination fee due to reduction in consolidated assets - Year 1 30.0    
Termination fee due to reduction in consolidated assets - Year 2 15.0    
Termination fee due to reduction in consolidated assets - Year 3 $ 5.0    
Safehold Management Services | Affiliated entity | Minimum      
Schedule of Equity Method Investments [Line Items]      
Notice required to terminate management agreement without cause 180 days